FIN INIT

node_modules/sucrase/dist/util/getClassInfo.js

@@ -0,0 +1,352 @@
+"use strict";Object.defineProperty(exports, "__esModule", {value: true});
+
+var _keywords = require('../parser/tokenizer/keywords');
+var _types = require('../parser/tokenizer/types');
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+/**
+ * Get information about the class fields for this class, given a token processor pointing to the
+ * open-brace at the start of the class.
+ */
+ function getClassInfo(
+  rootTransformer,
+  tokens,
+  nameManager,
+  disableESTransforms,
+) {
+  const snapshot = tokens.snapshot();
+
+  const headerInfo = processClassHeader(tokens);
+
+  let constructorInitializerStatements = [];
+  const instanceInitializerNames = [];
+  const staticInitializerNames = [];
+  let constructorInsertPos = null;
+  const fields = [];
+  const rangesToRemove = [];
+
+  const classContextId = tokens.currentToken().contextId;
+  if (classContextId == null) {
+    throw new Error("Expected non-null class context ID on class open-brace.");
+  }
+
+  tokens.nextToken();
+  while (!tokens.matchesContextIdAndLabel(_types.TokenType.braceR, classContextId)) {
+    if (tokens.matchesContextual(_keywords.ContextualKeyword._constructor) && !tokens.currentToken().isType) {
+      ({constructorInitializerStatements, constructorInsertPos} = processConstructor(tokens));
+    } else if (tokens.matches1(_types.TokenType.semi)) {
+      if (!disableESTransforms) {
+        rangesToRemove.push({start: tokens.currentIndex(), end: tokens.currentIndex() + 1});
+      }
+      tokens.nextToken();
+    } else if (tokens.currentToken().isType) {
+      tokens.nextToken();
+    } else {
+      // Either a method or a field. Skip to the identifier part.
+      const statementStartIndex = tokens.currentIndex();
+      let isStatic = false;
+      let isESPrivate = false;
+      let isDeclareOrAbstract = false;
+      while (isAccessModifier(tokens.currentToken())) {
+        if (tokens.matches1(_types.TokenType._static)) {
+          isStatic = true;
+        }
+        if (tokens.matches1(_types.TokenType.hash)) {
+          isESPrivate = true;
+        }
+        if (tokens.matches1(_types.TokenType._declare) || tokens.matches1(_types.TokenType._abstract)) {
+          isDeclareOrAbstract = true;
+        }
+        tokens.nextToken();
+      }
+      if (isStatic && tokens.matches1(_types.TokenType.braceL)) {
+        // This is a static block, so don't process it in any special way.
+        skipToNextClassElement(tokens, classContextId);
+        continue;
+      }
+      if (isESPrivate) {
+        // Sucrase doesn't attempt to transpile private fields; just leave them as-is.
+        skipToNextClassElement(tokens, classContextId);
+        continue;
+      }
+      if (
+        tokens.matchesContextual(_keywords.ContextualKeyword._constructor) &&
+        !tokens.currentToken().isType
+      ) {
+        ({constructorInitializerStatements, constructorInsertPos} = processConstructor(tokens));
+        continue;
+      }
+
+      const nameStartIndex = tokens.currentIndex();
+      skipFieldName(tokens);
+      if (tokens.matches1(_types.TokenType.lessThan) || tokens.matches1(_types.TokenType.parenL)) {
+        // This is a method, so nothing to process.
+        skipToNextClassElement(tokens, classContextId);
+        continue;
+      }
+      // There might be a type annotation that we need to skip.
+      while (tokens.currentToken().isType) {
+        tokens.nextToken();
+      }
+      if (tokens.matches1(_types.TokenType.eq)) {
+        const equalsIndex = tokens.currentIndex();
+        // This is an initializer, so we need to wrap in an initializer method.
+        const valueEnd = tokens.currentToken().rhsEndIndex;
+        if (valueEnd == null) {
+          throw new Error("Expected rhsEndIndex on class field assignment.");
+        }
+        tokens.nextToken();
+        while (tokens.currentIndex() < valueEnd) {
+          rootTransformer.processToken();
+        }
+        let initializerName;
+        if (isStatic) {
+          initializerName = nameManager.claimFreeName("__initStatic");
+          staticInitializerNames.push(initializerName);
+        } else {
+          initializerName = nameManager.claimFreeName("__init");
+          instanceInitializerNames.push(initializerName);
+        }
+        // Fields start at the name, so `static x = 1;` has a field range of `x = 1;`.
+        fields.push({
+          initializerName,
+          equalsIndex,
+          start: nameStartIndex,
+          end: tokens.currentIndex(),
+        });
+      } else if (!disableESTransforms || isDeclareOrAbstract) {
+        // This is a regular field declaration, like `x;`. With the class transform enabled, we just
+        // remove the line so that no output is produced. With the class transform disabled, we
+        // usually want to preserve the declaration (but still strip types), but if the `declare`
+        // or `abstract` keyword is specified, we should remove the line to avoid initializing the
+        // value to undefined.
+        rangesToRemove.push({start: statementStartIndex, end: tokens.currentIndex()});
+      }
+    }
+  }
+
+  tokens.restoreToSnapshot(snapshot);
+  if (disableESTransforms) {
+    // With ES transforms disabled, we don't want to transform regular class
+    // field declarations, and we don't need to do any additional tricks to
+    // reference the constructor for static init, but we still need to transform
+    // TypeScript field initializers defined as constructor parameters and we
+    // still need to remove `declare` fields. For now, we run the same code
+    // path but omit any field information, as if the class had no field
+    // declarations. In the future, when we fully drop the class fields
+    // transform, we can simplify this code significantly.
+    return {
+      headerInfo,
+      constructorInitializerStatements,
+      instanceInitializerNames: [],
+      staticInitializerNames: [],
+      constructorInsertPos,
+      fields: [],
+      rangesToRemove,
+    };
+  } else {
+    return {
+      headerInfo,
+      constructorInitializerStatements,
+      instanceInitializerNames,
+      staticInitializerNames,
+      constructorInsertPos,
+      fields,
+      rangesToRemove,
+    };
+  }
+} exports.default = getClassInfo;
+
+/**
+ * Move the token processor to the next method/field in the class.
+ *
+ * To do that, we seek forward to the next start of a class name (either an open
+ * bracket or an identifier, or the closing curly brace), then seek backward to
+ * include any access modifiers.
+ */
+function skipToNextClassElement(tokens, classContextId) {
+  tokens.nextToken();
+  while (tokens.currentToken().contextId !== classContextId) {
+    tokens.nextToken();
+  }
+  while (isAccessModifier(tokens.tokenAtRelativeIndex(-1))) {
+    tokens.previousToken();
+  }
+}
+
+function processClassHeader(tokens) {
+  const classToken = tokens.currentToken();
+  const contextId = classToken.contextId;
+  if (contextId == null) {
+    throw new Error("Expected context ID on class token.");
+  }
+  const isExpression = classToken.isExpression;
+  if (isExpression == null) {
+    throw new Error("Expected isExpression on class token.");
+  }
+  let className = null;
+  let hasSuperclass = false;
+  tokens.nextToken();
+  if (tokens.matches1(_types.TokenType.name)) {
+    className = tokens.identifierName();
+  }
+  while (!tokens.matchesContextIdAndLabel(_types.TokenType.braceL, contextId)) {
+    // If this has a superclass, there will always be an `extends` token. If it doesn't have a
+    // superclass, only type parameters and `implements` clauses can show up here, all of which
+    // consist only of type tokens. A declaration like `class A<B extends C> {` should *not* count
+    // as having a superclass.
+    if (tokens.matches1(_types.TokenType._extends) && !tokens.currentToken().isType) {
+      hasSuperclass = true;
+    }
+    tokens.nextToken();
+  }
+  return {isExpression, className, hasSuperclass};
+}
+
+/**
+ * Extract useful information out of a constructor, starting at the "constructor" name.
+ */
+function processConstructor(tokens)
+
+
+ {
+  const constructorInitializerStatements = [];
+
+  tokens.nextToken();
+  const constructorContextId = tokens.currentToken().contextId;
+  if (constructorContextId == null) {
+    throw new Error("Expected context ID on open-paren starting constructor params.");
+  }
+  // Advance through parameters looking for access modifiers.
+  while (!tokens.matchesContextIdAndLabel(_types.TokenType.parenR, constructorContextId)) {
+    if (tokens.currentToken().contextId === constructorContextId) {
+      // Current token is an open paren or comma just before a param, so check
+      // that param for access modifiers.
+      tokens.nextToken();
+      if (isAccessModifier(tokens.currentToken())) {
+        tokens.nextToken();
+        while (isAccessModifier(tokens.currentToken())) {
+          tokens.nextToken();
+        }
+        const token = tokens.currentToken();
+        if (token.type !== _types.TokenType.name) {
+          throw new Error("Expected identifier after access modifiers in constructor arg.");
+        }
+        const name = tokens.identifierNameForToken(token);
+        constructorInitializerStatements.push(`this.${name} = ${name}`);
+      }
+    } else {
+      tokens.nextToken();
+    }
+  }
+  // )
+  tokens.nextToken();
+  // Constructor type annotations are invalid, but skip them anyway since
+  // they're easy to skip.
+  while (tokens.currentToken().isType) {
+    tokens.nextToken();
+  }
+  let constructorInsertPos = tokens.currentIndex();
+
+  // Advance through body looking for a super call.
+  let foundSuperCall = false;
+  while (!tokens.matchesContextIdAndLabel(_types.TokenType.braceR, constructorContextId)) {
+    if (!foundSuperCall && tokens.matches2(_types.TokenType._super, _types.TokenType.parenL)) {
+      tokens.nextToken();
+      const superCallContextId = tokens.currentToken().contextId;
+      if (superCallContextId == null) {
+        throw new Error("Expected a context ID on the super call");
+      }
+      while (!tokens.matchesContextIdAndLabel(_types.TokenType.parenR, superCallContextId)) {
+        tokens.nextToken();
+      }
+      constructorInsertPos = tokens.currentIndex();
+      foundSuperCall = true;
+    }
+    tokens.nextToken();
+  }
+  // }
+  tokens.nextToken();
+
+  return {constructorInitializerStatements, constructorInsertPos};
+}
+
+/**
+ * Determine if this is any token that can go before the name in a method/field.
+ */
+function isAccessModifier(token) {
+  return [
+    _types.TokenType._async,
+    _types.TokenType._get,
+    _types.TokenType._set,
+    _types.TokenType.plus,
+    _types.TokenType.minus,
+    _types.TokenType._readonly,
+    _types.TokenType._static,
+    _types.TokenType._public,
+    _types.TokenType._private,
+    _types.TokenType._protected,
+    _types.TokenType._override,
+    _types.TokenType._abstract,
+    _types.TokenType.star,
+    _types.TokenType._declare,
+    _types.TokenType.hash,
+  ].includes(token.type);
+}
+
+/**
+ * The next token or set of tokens is either an identifier or an expression in square brackets, for
+ * a method or field name.
+ */
+function skipFieldName(tokens) {
+  if (tokens.matches1(_types.TokenType.bracketL)) {
+    const startToken = tokens.currentToken();
+    const classContextId = startToken.contextId;
+    if (classContextId == null) {
+      throw new Error("Expected class context ID on computed name open bracket.");
+    }
+    while (!tokens.matchesContextIdAndLabel(_types.TokenType.bracketR, classContextId)) {
+      tokens.nextToken();
+    }
+    tokens.nextToken();
+  } else {
+    tokens.nextToken();
+  }
+}